Track brake



K. E. WENZEL May 2, 1933.

TRACK BRAKE 2 Sheets-Sheet 1 Filed Oct. 18, 1926 y 1933- Y K. E. WENZEL1,906,348

TRACK BRAKE Filed Oct. 1926 2 Sheets-Sheet 2 JHUST'ZZET'I Karl E r1161?wen eil.

BJJWM Patented May 2, 1 933 unites sT TEs masts PATE T me KARL ERNSTWENZEL, or imlvrnonn-onrnn-nnlnn;'snnmnnir, rissrenon, BY MnsnnASSIGNMENTS, TO. THE HANNAUEE one nn'raannn cor/Iran's, or .onronoo;ILLINOIS, A consort-a 161% or rLmNoIs TRACK BRAKE Application filedOctober 1a, 1926, Serial No. 142,2224, and in Gelmany October as, 1925".

My invention relates to improvements in track brakes for railways, andmore particularly in track brakes comprising a pair of brake shoeslocated at opposite sides of each rail, one or both shoes beingrockingly mounted and one having a flange on which the wheel of thevehicle to be braked rolls, so as to de-' press the brake shoe to forcethe sameinto braking contact with the side face of the wheel, thebraking power depending onthe pressure of the car wheel-on the flange.An object of these improvementsis to provide a brake of this type inwhich the braking action is improved, and with this object in view myinvention consists in supporting a rocking member cooperating with thebrake shoe so that it is capable of rolling with its end on its support.For the purpose ofvexplaining the Figures 3 and 4 of modified forms ofthe 'de I vice.

Figure 7 is a sectional view taken on'the line 77 of Figures 3 and 4. V

' In the modification shown in Figure 1 my improved track brake includessupporting means or base 6 disposed transversely of the rail 7" andformed withbearing faces (2 and (Z, the rail being disposed on anysuitable fixed foundation r shown in this and the succeedingmodifications as separate structural members supporting a wooden blockon which the track rail is mounted. To the face (Z a brake shoe in theform of a rail f is fixed, the head of the said rail being in positionfor engaging the inner face of the car wheel The outer face of the carwheel is adapted to be engaged by a brake shoe a, which may likewise bein the form of a rail,

which rail however is located so that it engages the car wheel with theside of its head, and so that its flange a 'is in position wherebythe'car wheel, moving through the track brake, rolls thereon. The rail(1 is carried by a rocking member or lever Z), the outer end 0 of whichis rounded or'cam shaped. The inner end of the lever is supported on aspring 8 capable of holding the rail in braking position but yieldableto the pressure imposed by the car wheel on the flange a. The slide orbase 6 may be. movl ably supported on a member or support such as shownin Frolich'Patent No. 1,635,989,

granted July 19, 1927, adapted to be raised by mechanism such as shownin this patent, to move the shoes from inoperative position to anoperative position with respect to the rails 1- whereby car wheelsoperating along the rails 7 may be contacted by said shoes to effectbraking action. I i

iVhen a car moves through the track brake a when the brake isinoperative position, the

wheels roll on the flange a. Thereby the rail a isflforceddownwardly,and by reason of the toggle action of the lever Z) the braking pressureof the head a .onthe wheel 9 isfin creased according to the weight ofthe'car. In applying the brakes, it will be seen that the shoe a ispressed toward the left, as viewed in Figure 1, thereby moving ortending. to move the slide'c toward the left to apply braking pressurethrough the shoe 7 to the wheel 9. hen theslide is in loweredinoperative position, the wheels pass through the brake mechanism clearof the shoes whereby no operation is effected. 1

In Figure 2, I have shown a modification in which the rocking lever b isnot directly connected to the rail (1, but in which. it is jointed by abolt 2' to an arm h of a member havlng a part'lc directed downwardly andengaging a pm n mounted on the slide or base e-through a verticallydisposedslot'r rzh Otherwise the construction'is the same as the rail a,the rail normally being resiliently supported by spring 8 provided onthe slide and engaging bracket .2 carried by member 7b. In operation ofthis modification, it will be assumed that the lifting mechanism for theslide 6 is similar to that indicated in connection with the modificationillustrated in Figure l,;. then when the slide has been disposed inposition where the shoes "areioperative to'eiicct braking operationof'thewheel g, the shoe a is engageable by the wheel 9. It will beunderstood that the shoe 0; in this and the succeeding modifications ismaintained in a raised position with respect to the slide 6 by meanssuch as a spring 8 disposed between bracket 2 and slide 6 as explainedabove, i'.'e., in a position where the pin n contacts the lower part ofthe slot m! l/Vheel g contacting shoe 0; tends to move the slide etoward the left, as viewed in Figure 2, through the lever o to therebyset the shoe 7. Contact between the lower flange of the shoe a movessaid shoe downwardly, rocking movement being eifected through the cam aand the surface cl, the shoe a moving downwardly substantially parallelto the rail 1" dueto the guide m and the rolling contact between 0 andcl. 7 s

The modification shown in Figure 3 is similar to the one shown in Figure2, with the exception, however, that thelever is jointed or pivoted tothe slide or base 6 by means of a bolt 0, and engages the arm h with arounded or cam end 0, the said rounded end being an arc of a circleconcentric with the bolt 0.

' As a matter offact, in lieu of the lever b a roller of substantiallythe disposition as indicated at p in Figure 5 may be provided tofunction similarly to the lever b of Figure 3. In the construction asshown in Figure 5 the roller is pivotally mounted as at 0 to the support6 and contacts the member h'which loosely mounts the shoe a fortranslational movement to the support 6. The shoe a is resilientlysupported on the support 6 through the springassembly a. While themember 6 in the construction'shown in'Figure 3 will be kept inworkingcontact with the element 72, by friction, the position of the member 6can be assured by the provision of the resilient support The resilientsupport j may consist essentially of two side members If integrallyattached to the support e as at t, each side member provided witharcuate slots 20 adapted to receive the bolt I), which extends throughthe lever 6 said bolt limiting therupward movement of the member 12 V Ihave also provided a spring :0 which will always bring the member 6 inreadiness, as shown in Fig. 7, and is attached to the support 6- as atw, which is also applicable to the modification shown in Fig. 4.

- In the modification shown in Figure 4:, the

of tl1 e lever b a roller such as shown at p in F1gure6 may be used iZOfLIIICi'JOIl 'lIl'El .mannersimilar to the lever t an Flgure 4.

Asin the case of the lever 6 both in the construction shown in Figures 4and 6, the re silient support 7' may be provided to maintain the leverZ1 and the member p in operative relation with respect to the support 0.

and the supporting member h. In using the roller construction 79 such asshown in Figure 6, the necessity arises that the spring type of supportbe applied to the axis of the roller. That is, the member 2; will be onthe axis of the member 39 by which the upward movement of this axis islimited by the pulling anchor, while the downward movement will beretarded by resting the roller on the hearing or support 0. The springwill always bring the roller 1? in readiness in the same manner as thespring members of the construction 6 aswill' readily be appreciated'.

While in describing the invention referencehas been made to particularexamples embodying the same, I wish it to be understood that myinventionis not limited to the constructions shown in the drawings, and thatvarious changes be made in the general arrangement of the apparatus andthe construction of its parts without departing from the invention.

I claim 1. In track brake mechanism, the combination of a brake shoeassociated with a rail, a support for said shoe, a member carrying saidshoe and pivotally mounted on said support, and cam means disposedbetween said shoe and support whereby movement of said shoe impartsmovement to said support.

2. In track brake mechanism, the combination of a track rail, brakeshoes disposed on both sidesof said rail for imparting braking action towheels operative on said rail, a sup port for said shoes, means carryingsaid shoes pivotally mounted on said support, and cam means between oneof said shoes and said support whereby movement of said shoe by saidwheels moves said support to move said other shoe to braking position.

'3; In track brake mechanism, the combination of a track rail, brakeshoes disposed on both sides of said rail for imparting braking actionto wheels operative on said rail, a support for said shoes, supportingmeans between said support and one of said shoes, and means including acam disposed between one of said shoes and said support whereby saidshoe is depressedin a direction substantially parallel to and by a wheeloperating along tion of a brake shoe associated with a rail, a

support for said shoe, supporting means be tween said support and shoe,and means including a pluralityv of cams disposed between said shoe andsupport whereby movement of said shoe is imparted to said support.

5. In track brake mechanism, the combination of a track rail, brakeshoes disposed on both sides of said rail for imparting braking actionto wheels operative on said rail,

a support for said shoes selectively movable to eilective brakingposition, and cam means between one of said shoes and said supportwhereby movement of said shoe by said Wheels moves said support to movesaid other shoe to braking position. H v

6. In track brake mechanism, the combination of a track rail, brakeshoes disposed on both sides of said rail for imparting braking actionto wheels operative on said rail, a support for said shoesselectivelyjmovable to effective braking position, resilient means formaintaining one of said brake shoes in wheel engaging position, and cammeans between said shoe and said support'whereby movement of said shoeby said wheels-moves said support to move said other shoe to brakingposition.

7. In track brake mechanism, the combination of a brake shoe associatedwith a rail, a support for said shoe, andmeans connecting said supportand shoe whereby said shoe is depressed in a direction substantiallyparallel to and by a wheel operating along said rail, said meansincluding a member pivotally mounted with respect to said shoe and cooperating therewith and contacting said support, and a shoe fixed tosaid support on the opposite side of said rail from said first namedshoe and movable into wheel braking position by movement of said firstnamed shoe.

8. In track brake mechanism, the combination of a brake shoe associatedwith a rail, a support for said shoe, and means connecting said supportand shoe whereby said shoe is depressed in a direction substantiallyparallel to and by a wheel operating along said rail, said meansincluding a member in rolling contact with said support and between saidshoe and support.

9. In track brake mechanism, the combination of a brake shoe associatedwith arail, a movable support for said shoe, means connecting saidsupport and shoe whereby said shoe is depressed in a directionsubstantially parallel to and by a wheel operating along said rail, saidmeans including a member secured to said shoe and loosely connected fortranslational movement to said support, and

a shoe fixed to said support on the opposite side of said rail from saidfirst named shoe, and movable into wheel braking position by movement ofsaid first named shoe.

10. In track brake mechanism, the combination of a brake shoe associatedwith a rail, a support'for said shoe, means connecting said support andshoe whereby said shoe is depressed in a direction substantiallyparallel to and by a wheel operating along said rail, said meansincludmg a member secured to said shoe and loosely connected to saldsupport. and a member pivotedto said last named member and contactingsaid support.

11. In track brake mechanism, the combination of a brake shoe associatedwith arail, a support for saidshoe, means connecting said support andshoe whereby said shoe is depressed in adirection substantially par-'allel to and by a wheel'operating along said rail', said means includinga member secured to said shoe and loosely connected to said support, anda member pivoted to said. supportand freely contacting said last namedmember. v

12. In track brake mechanism, the combination of a brake shoe associatedwith a rail, a support for said shoe, means connecting said support andshoe whereby said shoe is depressed in a direction substantiallyparallel to and by awheel operating along said rail, said meansincluding a member secured to said shoe and loosely connected to saidsupport, and ,a member in rolling contact with said last named memberand support.

18. In track brake mechanism, the combination of a track rail, brakeshoes disposed on both sides of said rail for imparting braking actionto wheels operativeon said rail, a support for said shoes, supportingmeans between said support and one of said shoes, and means disposedbetween one of said shoesand said support and including a member looselypivoted to said support for sliding movement with respect theretowhereby said shoe is depressed in a direction substantially parallel toand by a wheel operating along said rail and said other shoe is moved tobraking. position, said other shoe being fiXeCl to said support.

In testimony whereof I hereunto affix my s1gnature,

KARL ERNST WENZEL.

